容器和虚拟机 Container vs VM
docker-vs-vm
容器不是Mini虚拟机
容器其实是进程Containers are just processes
容器中的进程被限制了对CPU内存等资源的访问
当进程停止后，容器就退出了
容器的进程process
- 显示容器的进程：
docker container top <container ID>
image.png
Note
以下是在Ubuntu20.04中演示，因Windows环境下的Docker和Linux具有一些差异。pstree命令需要额外安装，可以使用yum install psmisc或者sudo apt-get install psmisc安装
➜ ~ docker container run -d nginx
57fe4033dd7e1e620a0b6a7b83b85d4f8f98772f0ce585624c384de254826fd0
➜ ~ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
57fe4033dd7e nginx "/docker-entrypoint.…" 4 seconds ago Up 3 seconds 80/tcp festive_proskuriakova
➜ ~ docker container top 57f
UID PID PPID C STIME TTY TIME CMD
root 7646 7625 0 12:14 ? 00:00:00 nginx: master process nginx -g daemon off;
systemd+ 7718 7646 0 12:14 ? 00:00:00 nginx: worker process
➜ ~
➜ ~
➜ ~ ps -aef --forest
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 May14 ? 00:00:00 /init
root 157 1 0 May14 ? 00:00:00 /init
root 523 157 0 May14 ? 00:02:32 \_ /usr/bin/dockerd -p /var/run/docker.pid
root 545 523 0 May14 ? 00:25:55 | \_ containerd --config /var/run/docker/containerd/containerd.toml --log-level info
root 7625 157 0 12:14 ? 00:00:00 \_ /usr/bin/containerd-shim-runc-v2 -namespace moby -id 57fe4033dd7e1e620a0b6a7b83b85d4f8f98772f0ce585624c384de254826fd0 -address /var/run/d
root 7646 7625 0 12:14 ? 00:00:00 \_ nginx: master process nginx -g daemon off;
systemd+ 7718 7646 0 12:14 ? 00:00:00 \_ nginx: worker process
root 6442 1 0 May18 ? 00:00:00 /init
root 6443 6442 0 May18 ? 00:00:00 \_ /init
penxiao 6444 6443 0 May18 pts/2 00:00:01 \_ -zsh
penxiao 7770 6444 0 12:15 pts/2 00:00:00 \_ ps -aef --forest
➜ ~
➜ ~ pstree -halps 7718
init,1
└─init,157
└─containerd-shim,7625 -namespace moby -id 57fe4033dd7e1e620a0b6a7b83b85d4f8f98772f0ce585624c384de254826fd0 -address /var/run/docker/containerd/containerd.sock
└─nginx,7646
└─nginx,7718
Gain Access to the MobyLinux VM on Windows or MacOS
https://nickjanetakis.com/blog/docker-tip-70-gain-access-to-the-mobylinux-vm-on-windows-or-macos
